Ma1eficent t1_iz5aitq wrote
Reply to comment by tidehyon in Scientists have analyzed the specific labor costs for producing a 1 carat diamond in mines and through artificial synthesis. The work of human turned out to be more effective: 26 minutes versus 2-3.5 hours. by Skoltech_
If you buy sapphires from a gem quality lab there are no parallel lines or tells other than how perfect and flaw free they are. And corundum is sapphire.
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